Sophora japonica blooms in April and May every year, and the flowering period is usually around 10 ~ 15 days. Sophora japonica, also known as Sophora japonica, is widely planted in various parts of China, and has very good ornamental value. Whenever the flowering period comes, white Sophora japonica will be covered with branches, and the air is filled with a faint elegant fragrance.

Morphological characteristics of Sophora japonica;

Robinia pseudoacacia is a perennial flower with racemes and butterfly-shaped corollas, which are clustered and overlapped in full bloom. Small flowers shrink and curl, and petals are scattered. Complete calyx bell-shaped, yellow-green, apex 5-lobed; Petals 5, mostly yellow or yellow-white, also have other colors such as purple (see figure). Usually 1 petal is large, nearly round, slightly concave at the apex, and the other four petals are rectangular; Stamens 10, of which 9 bases are United and filaments are slender; Pistil cylindrical, curved.

Sophora japonica is a deciduous tree with a height of 8-20m. Bark is gray-brown, with irregular longitudinal cracks, bright yellow endothelium and foul smell; The shoots are dark green, nearly smooth or short-haired, with obvious lenticels.